Frameless window screen



Oct. 19, 1954 LANG 2,692,017

FRAMELESS wmnow SCREEN Filed Oct. 20, 1951 iiiiiiiiiiiiili iiiiil hhiliiil INVENTOR. 415: M

Patented Oct. 19, 1954 UNITED STATES PATENT OFFICE FRAMELESS WINDOW SCREEN Albert Lang, Oakland, Calif.

Application October 20, 1951, Serial No. 252,237

3 Claims. '1

This inVention relates to a frameless window screen.

It is important when a frameless window screen is attached to or mounted on a window frame that the side margins of the frameless screen lie fiat against the sides of the window frame in uninterrupted contact throughout the length of the margins to prevent insects and the like from entry between the side margins and the sides of the window frame. This ideal situation has been possible only with a certain percentage of an order or lot of screens, the remaining screens having buckles or the like therein preventing the uninterrupted contact desired. Some of these remaining screens have been necessarily discarded and scrapped with a consequent increase in the price of the utilized screens, and other remaining screens have been utilized but with the above-mentioned disadvantages.

Buckling of frameless screens is particularly found in screens having re-eniorced margins because these margins must be specially formed. It is difiicult to form the margins of exactly the same length as the body of the screen therefore producing buckled margins.

A main object of the present invention is to provide a frameless window screen with the side margins thereof so formed that when the screen is mounted in place its side margins will lie flat against the sides of the window frame.

Another object of the present invention is to provide a frameless window screen having extensible contracted side margins so that when the screen is mounted in place, the side margins will be stretched to ensure uninterrupted contact between the side margins and the sides of the window frame throughout the length of the side margins, even though the side margins were originally buckled.

A further object of the present invention is to provide a frameless window screen in which the side margins only of the screen are corrugated to provide extensible contracted margins.

A still further object of the present invention is to provide a frameless screen as above described in which the amplitude of the corrugations progressively decreases inwardly toward the body of the screen so that the corrugations blend into the body of the screen without the production of wrinkles or the like in the body at the inner ends of the corrugations.

Various other objects will be apparent from the following description taken in connection with the accompanying drawings wherein:

Fig. 1 shows a frameless window screen of the type usually mounted on a window frame.

Fig. 2 is a view similar to Fig. 1 showing a screen embodying the concepts of the present invention and-having its side margins corrugated to provide extensible contracted side margins.

Fig. 3 is an enlarged fragmentary side view of the screen of Fig. 2, showing the corrugations.

Fig. 4 is an enlarged fragmentary plan view of the screen disclosed in Fig. 2 showing how the amplitude of the corrugations progressively decreases so that the corrugations blend into the body of the screen.

Fig. 5 is a vertical sectional view through a window frame having a frameless screen of the present invention mounted thereon.

Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, Fig. 1 shows a frameless window screen ID of ordinary construction in which it is assumed that the side margins thereof are buckled. The frameless window screens referred to in this specification are constructed of a conventional frameless screen material which has suficient resiliency to allow it to be stretched a limited extent, said resiliency causing this screen to substantially assume its initial state after the stretching forces have been removed. However, even though the side margins are not buckled to a degree making the screen useless, still very few screens are produced so that the side margins thereof are exactly flat with the sides of the window frame, and therefore by providing the corrugations of the present inven-- tion in the side margins of all the produced screens, a better contact on all the screens is obtained. Frameless screen ID has its upper and lower end margins reversely bent at H and i2 so as to provide means by which the screen can be held by top and bottom holding structures.

Fig. 2 shows a screen generally entitled l3 embodying the concepts of the present invention and differing from the screen disclosed in Fig. l in that its side margins, entitled [A and 15, have corrugations formed therein, such as by opposed gears, or similar contrivances, so that the side margins are contracted and are shorter than the vertical length of the body of the screen as indicated at M and I5 and appreciated by a comparison of Figs. 1 and 2, to provide contracted extensible side margins. Preferably, the corrugations progressively decrease in amplitude inwardly toward the body of the screen so as to blend into the body without the production of wrinkles at the inner end of the corrugations (see Fig. 4).

Screen l3 has bent ends l6 and I1 for purposes of attachment. In producing a screen as shown in Fig. 2, it is preferable to form the corrugations in the screen prior to the bending of the ends I6 and I1. However, the invention is not intended to be limited by this stated preference, and the ends may be formed either before or after the formation of the corrugations therein, although I have found it convenient to form the corrugations prior to the forming of the bent ends.

Fig. shows a window frame generally entitled I8 having a head I9 and a sill 28 to which the upper and lower ends of the frameless window screen I3 are adapted to be respectively held or attached. The upper end I6 of frameless window screen I3 fits within a top holding structure generally entitled 2| which is secured to the head I9 such as by screws 22. The bottom end ll of screen I3 fits within a bottom holding structure 23 which is detachably latched to sill 20 by latching screws 24. The particular forms of top holding and bottom holding structures disclosed in Fig. 5 is not intended to limit the invention, but only to show means by which the frameless window screen 13 can be applied to a window frame and the side margins thereof stretched or extended so that the side margins will lie flat against the frame sides 25, one of which is shown in Fig. 5. It is obvious from a comparison of Figs. 2 and 5 that when the frameless screen I3 is tensioned by the bottom holding structure 23, the contracted side margins I4 and I5 will be extended to lie fiat against the frame sides 25 regardless of the fact that initially the side margins were buckled.

By the present invention a frameless window screen, initially having buckles therein, can be formed so that when mounted on a window frame the side margins thereof will lie flat against the sides of the window frame and prevent the entry of insects and the like between the side margins of the window screen and the sides of the win- I dow frame.

While I have shown the preferred form of my invention, it is to be understood that various changes may be made in this construction by those skilled in the art without departing from the spirit of the invention as defined in the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

l. A frameless screen comprising a sheet of resilient screen material adapted to be held over a window opening to close the opening, said sheet of screen material having corrugated side margins slightly shorter in length than the uncorrugated central portion, whereby the side margins may be stretched when the sheet is mounted on the window frame to ensure uninterrupted contact between the side margins and the sides of the window frame.

2. A frameless screen comprising a sheet of resilient screen material adapted to be held over a window opening to close the opening, said sheet of screen material having corrugated side margins slightly shorter in length than the uncorrugated central portion, whereby the side margins may be stretched when the sheet is mounted on the window frame to ensure uninterrupted contact between the side margins and the sides of the window frame, the corrugations progressively decreasing in amplitude. from the side edges inwardly so that the corrugations blend into the body of the screen.

3. A frameless window screen construction comprising a flexible sheet of resilient screen material adapted to be held over a window opening of a window frame to close said opening, said sheet having an initially rectangular form and having its side margins corrugated to slightly contract said side margins longitudinally of the screen, and means attached to the upper and lower edges of the sheet for mounting the sheet on a frame and stretching said contracted margins to extend the same and insure uninterrupted contact between the side margin and the sides of the window frame.

References Cited in the file of this patent UNITED STATES PATENTS 

